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Title:

Image Analysis of the Internal Structure of Warm-Mix Asphalt (WMA) Mixtures

Accession Number:

01373797

Record Type:

Component

Abstract:

Warm mix asphalt (WMA) constitutes an alternative for fabrication of asphalt mixtures at lower temperatures (in the range of 20°C to 50°C) than those used for conventional hot mix asphalt (HMA), with positive environmental, engineering, and economical effects. This paper focuses on the analysis of the mixture internal structure of WMA as compared to that of corresponding control-HMA mixtures. Hence, the main objective of the paper is to quantify the modifications induced on the asphalt mixture internal structure using four WMA technologies (Rediset®, Asphamin®, Sasobit®, and Evotherm DAT®), since these changes are related to the mixture performance. The analysis was based on X-ray Computed Tomography scanning and subsequent image analyses, conducted in terms of the air voids (AV) characteristics that included the distribution of content, size, and connectivity. Corresponding results suggests that the reduction of compaction temperature based on the inclusion of WMA additives, generated laboratory gyratory compacted specimens with similar AV characteristics (for mixtures compacted at similar TAV content values) to those obtained in conventional control-HMA mixtures. Comparison of road cores is limited at this time, although the data analyzed preliminarily supports the same conclusion provided for the gyratory compacted specimens. Specific recommendations were also included for improved fabrication of gyratory compacted specimens produced for WMA mixture evaluation.

Supplemental Notes:

This paper was sponsored by TRB committee AFK30 Characteristics of Nonasphalt Components of Asphalt Paving Mixtures

Monograph Accession #:

01362476

Report/Paper Numbers:

12-1929

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Alvarez, Allex E
Carvajal, Juan Sebastian
Reyes-Ortiz, Oscar
Walubita, Lubinda F
Estakhri, Cindy K

Pagination:

17p

Publication Date:

2012

Conference:

Transportation Research Board 91st Annual Meeting

Location: Washington DC, United States
Date: 2012-1-22 to 2012-1-26
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Uncontrolled Terms:

Internal structure (Materials)

Subject Areas:

Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I30: Materials

Source Data:

Transportation Research Board Annual Meeting 2012 Paper #12-1929

Files:

TRIS, TRB

Created Date:

Feb 8 2012 5:06PM